Method of treating piston rings



Nov. z3 ,1926. 1,608,101 c. E. JOHNSON METHOD OF' TREATING PISTON RINGSOriginal Filed March 24l 1924 /Hhg. s t? erA Q 7/ 1/1 Patented Non. 5232i unirse stares CHARLES E. JOHNSON, 03? MUSKEGN, MIC

COMPANY, OF MUSKEGGN HEEGHTS, MCHGAN, L

Ldidi can, i

:METHOD OF TREATING- E'STGET Giigiiial application filed March 24.,1924, Serial No. 791,245. Divided and this application filed FebruaryThis invention relates to a method of treating` piston rings suoli `asare used in internal combustion or other 'en ines particularly to make aseal against the'passaya'e 5 of lubricating oil or exhaust gases in aninternal combustion engine by the piston with which the rings are used.The present application is a division from my pendific; application forpatent Ser. No. 701,245,

filed March 24, 1924 for Piston Bing, resultw cylinders to makeparticularly effective seals of the character stated, being especiallyeffective in removing' excess oil which may be on the inner walls of thecylinders in which the rings are installed, and to produce n u 0 suchrings by a. simple and effective method,

very economical to practice and very practical for the obtaining` ofpiston rings in the large quantities which now must be de r forsupplying the demand made by the auto- 0 motive industry. This obyectand many others not specifically enumerated at this time will appear,lVtogether with the novel method for attaining the same as understandingof the invention is had .from the following description, taken inconnect-ion with the accompanying drawing, in which, Fig. l is a planView of the ring, with parts broken away and shown in section, themethod followed for cutting; the oil draining' slots in the ring beingshown. Fig. Q is an elevation of the ring. Fig. 3 is a vertical sectiontherethrough. Fig. i is a somewhat enlarged section through a side ofthe'ring, showing manner in which the slots are cut therein. and theapproximate angle of the cuttiY saw with respect to the plane of hering` Fig. 5 is a fragmentary enlarged vertical section through a wallofen engine cylin er and adjacent parts of a piston and ring' carriedthereby, and

Fin'. G is a view similarto Fig. 5, showing` a slightly different forniof ring construction made by the same method.r

Like reference characters refer to like parts in the different figuresof the drawing'.

The piston ring l, preferably, is made 1 53 cut .n the ring lSerial Ele.3.465.

t, v 1 1 from individuai ring castings machined on all sides except theinner Vcuri/Red sideby use of any desired method of manufacture.,

though in practice 'the method which follow is that disclosed in myPatent No; 1922', wherebi,7 avv 1rfi-052517, issued Feb. 7, Y pistonring' is made so that it will be a true circle when closed at itspart-ed side. The present method forming the subject matter of' thisinvention is directed. to additional features and methods of treating`the same. rlhe piston ring' is partedat one side, a. at 2, the well.known lap-joint 'parting' heine' showinthough'any other type of jointcan be used quite as well in so far as the present invention isconcerned.

With my invention rines of the char; outlined are provided with slots tlthrough sawed by a metal cutting` saw if the outside inwardly at aplurality of spa apart points in the periphery of the rino;l with thesaw set at an angle to the plane of the ring whereby the slots inclineupwardly and inwardly from the outer curved side to the inner curvedside of the rhin'. rlhe slots cut by the saw are cut in consecutiveorder around the ring and` preferably.y one saw cut or slot at its endsoverlaps the ends of theadiacent slots 3, 'as indicated at 4, therebymaking a continuous groove of varying); depth around the .ring which, atregular spaced intervals, extends throueh the ring' to the inner side,the slots on said inner side being;` shorter than at the outer side,there being substantially triancfular sections 5 between adjacent slots3, as shown in l. This follows from the circular shapeof the saw 6 andthe circular shape of the ring; with which it is used. A

The vrsaw, preferably, is located at an to the plane of the ring, asshown in Il, the slot-s 3 cut cur fing upwardly at each end from themiddle point of each slot,

Jthe oef-.1e around the ring` comprising a connected series ef scallops.Also the slots extend upwardly and inw rdly at an angle to thehorizontal, and the edge between the upper side of-each slotand theouter curved side of the ring is made more sharp due to thevacute anglebetween said side of the slot and the outer curved side of the ring. tisevident that the slots lili) may be cut so that the adjacent endsthereof do not meet and overlap, as shown in my pending application Ser.No. 714,256, filed May 19, 192e in accordance with this method oi makingthe rings. lt is also clear that the slots do not need to be cut singlyand in consecutive order around the ring, it being possible to use anumber ot saws in 'a gang for cutting the slots, particularly rt' theends ot the slots do not meet and overlap, and my invention comprehendssuch use and is not to be considered as rest-ricted to the specificdisclosure made in these respects..

lThe rings are designed to be placed in ring grooves, indicated at 7 inFigs. 5 and 6, which are formed in pistons 8, so that the outer curvedsides ot the rings will bear against the inner sides or' the cylinderwalls 9 ot an internal combustion or other engine. As the piston movesup and down inthe cylinder, the oil which may be adhrring to the wallsof the cylinder is scraped there- -from and passes inwardly through theslots 3 to the ring grooves T bach ot' the rings, being drainedtherefrom through outlet openings 1'() made through the. piston from thering grooves to the inner sides outl said piston.

1t is evident that 'this method of treating piston rings is Very simpleand effective, the slots being readily sawed through the ring andforming slots ot scalloped term at their outer ends which in conjunctionwith the upward and inward inclination ot said slots makes not only anacute scraping edge, but also accomplishes a shearing action in additionto the scraping action in removing the excess ot oil from the cylinderwalls. In the slightly modified or different construction yshown in Fig.6, asmall portion of the metal ot the ring is removed below the lowerside ot each of the slots 3, as indicated at 11, this aiding the oilscraping action by providing a larger space in which the oil may becollected and at the same time arovidi-ng a more complete seal againstthe passage of exhaust- Oa-ses or the compressed fuel and air mixture bythe piston. Fne invention is very practical and commercially yaluab-leand is used extensiveiy in the production of piston rings. Saidinvention is deined in the appended claims and is to iston rings i 'LingV into the ring tr n the outside inward and through the ring', saidcutting member being located at an a'igle to the piane of the ri; g.

3. rEhe method of treating piston rings which consists in sawing aplurality of slots troni the outer curifed side ot a ring and throughthe ring to the inner curved side thereof, said slots having their ends.at the outer side o1" the ring joining, the saw l' eing positioned atanV angle to the plane ot the ring during the sawing operation.

Ll. The method of treating piston rings which consists in cuttingthrough, and in-V wardly trom the outer curved side ot a sub-Vstantially circular ring, a slot with circularly arcuate ends and tlatsides inclined to the. parallel sides or" the ring.

5. rlhe method o' treating piston rings which consists in cutti gthrough, and inwardly from the outer curved side of a substantiallycircular ring, a circun'iterentially extending series or slots withcircularly ai"- cuate inner and outer ends and fiat sides inclined tothe parailellsides of the ring.

6. The method of treat-ing pist-on Yrings which consists incutting'through, and inwardly from the outer curved side ot asubstantially circular ring, a circumterentiallyextending series ofslots coinn'iunicating at said side oi' the ring' and haring circulariyarcuate ends and flat sides inclined to the parallel sides of the ring.

In testimony whereof ture.

adiii my signa- CHARLES JOHNSON.

substantially circular Y

